<!DOCTYPE HTML>
<html reftest-async-scroll
      reftest-displayport-x="0" reftest-displayport-y="0"
      reftest-displayport-w="800" reftest-displayport-h="2000"
      reftest-async-scroll-x="0" reftest-async-scroll-y="1800">
<!-- This is a simple test where we set the async-scroll position so that it
     extends outside the displayport, and ensure that the checkerboarded area
     is filled with the expected background color. -->
<body style="background-color: green; height: 5000px; overflow:hidden">
  <div style="position:absolute; left: 0px; top: 1800px; width: 100px; height: 400px; background-color: red"></div>
</body>
